Jig



N. E. cooK v Oct. 20, 1953 JIG 3 Sheets-Sheet l Filed Oct. 29, 1951 O ct. 20, 1953 N. E. COOK 2,655,821

JIG

Filed oet. 29, 1951 3 sheets-sheet 2 N. E. COOK Oct. 20, 1953 5 Sheets-Sheet 3' Filed Oct. 29, 1951 IIE-E- Patented Oct. 20, 1953 UNITED STATES PATENT OFFICE JIG 2 Claims.

This invention relates to jigs.

An object of this invention is to provide a basic jig which may be readily adapted .to meet the requirements of a specific operation.

Another Object of this invention is to provide a basic jig adapted to receive fittings which in turn provide a finished jig for a specific tool operation.

Another object of this invention is to provide a foundation jig, including a simple and positive quick locking device, which may readily be converted into a production jig for one or more specific operations upon work mounted therein.

Another object of this invention is to provide a jig adapted to cooperate with a wide range of tools and readily mounted to cooperate with said tools in the performance of a predetermined specific operation.

Another object of this invention is to provide a structure embodying the base elements of a jig which elements may be readily transformed and converted or have attachments secured thereto to produce a finished jig for some specic operation.

And another object of this invention is the elimination of delays in .tooling and production by the use of the basic jig construction herein disclosed wherein `a jig of the disclosure may be adapted on the job to a specic operation by the use of regular tools and the addition of simple parts thereto.

Other objects and advantages of this invention relating to the arrangement, operation and function of the related elements of the structure, to various details of construction, to combinations of parts and to economies of manufacture, will be apparent to those skilled in the art upon consideration of the following description and appended claims, reference being had to the accompanying drawings forming a part of this specification wherein like reference characters designate corresponding parts in the several views.

Referring to the drawings:

Fig. 1 is a perspective view of one form of the basic jig;

Fig. 2 is a plan view of the jig of Fig. 1, with a set of accessories added to adapt the jig to a specific operation;

Fig. 3 is a side elevation of the jig of Fig. l, parts being broken away, to show a typical treatment of the jig to meet a predetermined requirement;

Fig. 4 is a perspective view of a modified form of the basic jig;

Fig. 5 is a plan View of the jig of Fig. 4;

Fig. 6 is a plan View of a Work positioning element adapted for use with the jig of Fig. 4;

Fig. 7 is a side elevation, parts being broken away, of the jig of Fig. 4;

Fig. 8 is an end elevation of the jig of Fig. 4, parts being broken away;

Fig. 9 is a section vertically through a jig of the general type shown in Fig. 4, including a power operated clamp for the work mounted therein;

Fig. 10 is an end View of a modied form of the power clamping feature for the jigs; and

Fig. 11 is a plan view of the adjustment for the fulcrum of the power operated clamp element illustrated in Fig. l0.

A simple adaptation of the invention is illustrated in Figs. 1, 2 and 3, wherein the main frame element provides base plate or bed 20, herein shown as rectangular in form and having integral corner posts 22, 24, 26 and 28 extending from the faces of the bed-plate in opposite directions. These corner members provide legs 30 extending from one side of the plate and posts 32 extending in the opposite direction.

The extensions 32 of the parts 22, 24, have aligned openings 34 therethrough providing bearings for mounting hinge pin 36 spaced from and parallel to the plate 20.

The hinge pin 36 swingably mounts the cover or clamp plate 38 between the supports 22 and 24 to provide a gate for the region between the supports 26 and 23. The plate 38 is swingable into spaced parallel position with the bed plate 26 as limited by stops vlli on the inner sides of the iour supporting posts. The rear edge of the plate 38 may be bifurcated with the rear edges vertically contoured to engage the stops i0 when the plate 38 is swung to its open position and limits this rearward movement as shown in Fig. 3. The forward edge of the plate 38 is provided with a pair of lugs 44 mounting pin 46 as a hinge pin for a combined lock and grip element 48 including the grip extension 50 and a depending cam or hook portion 52. The inner edge of this element 54 is also contoured to limit its upward swing relatively to the plate 3B.

When the plate 38 is thrown forward from its open position, the handle 50 is centrifugally thrown to cause the cam 52 to firmly engage the pin 56 mounted by lugs 58 from a second grip portion 60 outwardly extending from the plateil. This provides a fast action locking mechanism operable by a minimum effort upon the part of an operator and the combined grips 50 and 66 provide a handle for ready maneuvering of this box like jig as formed by the plates 20, 38 and the connecting posts 22, 24, 26 and 28, which jig may be set into position adjacent a tool, either supported by the feet 30 or lthe posts 32 on their termini or on flattened sides 62 of the posts.

A piece of work 64 may be clamped between the plates 20 and 38 and locked therebetween by the action of the hook 52 engaging the pin 56. One of the elements serves as a work support and the other element being movable relatively thereto serves as the clamping member.

Either element, the plates 20 and 38, or both, may be tted with various type accessories such as bushings to act as locators for tools 68 in the nature of drillsi reamers, broaches and the like.

If the work piece 64 is of such dimensions, a replaceable riser plate may be attached to a plate together with a centering pin 12, if needed or desirable, or other locators may be added. At once, a work operation on the piece 64 is completed, .the grip 50 may be grasped andthe coverv or gate clamp 38 released by a single movement of the grip to release the work. 'Ehe'jig may bey turned to position a guide 66 for an additional operation. The placement of the accessoriesY 66', 'I0 and 'I2 may be predetermined according to the work to be performed and the basic jig is fitted accordingly. The box-like construction ao-rds' ample chip control and sufeient mass to firmly hold the work.

The rapid clamping' and release features fn'ay readily be incorporated into a foi-iriof the basic jig particularly adapted to handle cylindrical stock to be fabricated. As an example, the bed plate may be in the form of a block 30 having the legs 30inte`g1-a1 therewith. The block 80' is provided with planar face 82 longitudinally iiitersected by a seat such as a- V-g-roovefor mounting cylindrical stock' 96 to rest therein while receiving a tool operation. Longitudinal positioning is determined by av set screw stop 88 adjustable in arm 90 and locked therein by nut 92. The arm 90- isf an extension from a minor block 94 adjustably attached to one end ofthe base 80 by screw means 95.

A locator or guide bushing 66 for a tool 68, may be selectively' mounted in arm 98 overhanging the groove 84, which arm is one leg ofan L-shaped fitting |015, the other leg mounted in a vertically adjustable manner by bolt means |04 tolone side of theblock 80.

In the event the piece 85 is te be positioned on the block 80 with a relatively long overhang,- or in other words, the work` operationy is to be performed a considerable distanceA the terminus of the piece 86, afittingv |505 mayA re'-` place the minor block 94, which fitting has a: relatively long extension 00 from the block 8B and carriesarm ||0 mounting rod' H2 slidablyf adjustable therein to provide a stop H4, locked in position by set screw H5.

The means` for clamping' the workl 80 in the groove 84 against the gage 88 or H4 includes a bridge strap acrossl the groove 84 withv one end of this element engaged by bolt |22 to be vertically adjustable toward andY from the face 82 of the block 8e intermediate its length. The opposite end of the stra-p |20 engages a bolt- |24V which is also vertically adjustable in the body' 8|),v the upper terminus of this: latter bolt mounting pin |25 as a fulcrum for cam-s |28- which are parts 0f a handle element |30. These cams |28 operate against the upper face of the strap |20 as controlled by the handleAv |30 to prot/ide` a manual cam locking device", whereby' the strap can be clamped against the work' 0:6- or released therefrom.

A spring |32V may be disposed' between the strap |20 and block 8|) toautomatical'ly raise the clamp from the' work when the` cam lock is' opened.

The jigs herein can be readily adapted to have the clamping element power controlled as bya iluid operated piston and cylinder device. The strap or clamp |20 may directly mount acylY inder |34l with piston |136 thereinv movable to'Y reciprocate piston rod |38 carrying a terminal work engaging head |40. The strap |20 can be positioned relatively to the block by guide bolts |42 having. springs. |44 thereabout between thev clamp element and the block. The clamp |20 is provided with aperture |46l through which the piston rod |38 may extend to mount the head piece |40. The piston |36 is controlled by fluid pressure flowing through lines |48 to the opposite ends4 of the cylinder |34 as determined by valve 50' suitallly located adjacent an operators station:

The strap |20 may have one end thereof bear against fulcrum |52 with the piston rod |38 operating directly against extension |54 from the remote end of the strap. The fulcrum |52 is' verticallyadjustable by'rotat'ion of its mounting' bolt. |56 threaded. into the block. 80'.

It is obvious, the basic. jig, with its work supi port and cooperating clamp is susceptible to wide variations to accommodate variousl types of work and the"l accessory' additions readily added to adapt the jigs. to some specific opera-tion.

It is to be understood thatA the above detailed description of the present invention is intended to disclose an embodiment'thereof to those skilled in the art, but that; the invention is'. not to be construed as limited in its application to the details' of construction and. arrangement of. parts illustrated in the accompanying drawings, since the invention is capable of being practiced and carried out in various ways without departing from the spirit of the invention. rIfhe language used in the. specication. relating to the operation and functionV of the. elements of the invention is employed for purposes ofY description and not of limitation, and: it is: noti intended to limit the scope of the following claims beyond the re"-YA quirements of the prior art..

What is claimed andv desired to secure by United States Letters Patent is 1 1. In a basic jig adapted. to be fitted with selected. locators, a base plate.. corner posts attached to the edge surfaces of the plate and eX- tending above and below the platey a clamping element pivotally mounted between a pair of the posts below the; upper ends thereof. and movable intoi and from a position overlying; the base plate and swingable. between the corner' posts, stop means on the other' pai-r of corner posts for limiting the swinging movement of the. clamping'4 element relative to the base plate andv means carried by ther base plate and clamping element for releasably' locking the clamping element in such arrested positiom 2. The structure set forth` in claim` 1 wherein the releasable locking means between the base plate and the clamping element comprises a pin nxedly mounted on one of such elements and a cam swingably mounted on the other element, said cam comprising a hook adaptable to engage said pin and frictionally retain its contact there-Y with'.

E. COOK.

References Cited in the le of this patent UNITED STATES PATENTS' 

